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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c84799b6f0e6d22cf6a1257d607ed5ccd54e6f715ccc29d35a231ac5bdbc208' 
  AND token = 'yv3pqNSX59zARo7zk73Grv8rj+01J+HlTWFP0GsUJnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}